topic Re: Updating SCTimer match register without stopping the timer in LPC Microcontrollers

Updating SCTimer match register without stopping the timer

awseiger — Tue, 27 Apr 2021 21:35:26 GMT

I am implementing a multi-output PWM system, and I need to be able to update the PWM duty cycle of a single channel without disturbing other channels.

However, the SDK driver for the SCTimer stops the timer while changing the register match values. Commenting out the lines that are starting/stopping the SCTimer results in a hard fault.

Am I correct that there is no way to update the match value of an SCTimer event while the timer is running?

Thanks,

Alex

Re: Updating SCTimer match register without stopping the timer

Alice_Yang — Wed, 28 Apr 2021 08:46:57 GMT

Hello awseiger,

Yes, please check the User Manual of your chip:

Alice

Re: Updating SCTimer match register without stopping the timer

awseiger — Wed, 28 Apr 2021 12:25:55 GMT

Thank you for the confirmation! The SCTimer is very different from the timers I'm used to, so I want to make sure I understand the limitations.